Shooting at Colorado’s Arapahoe High School — Suspected Shooter Reportedly Dead, One Victim in Critical Condition

The victim reported to be in critical condition is a 15-year-old girl and it's unclear if Pierson intentionally shot her. Arapahoe County Sheriff Grayson Robinson also "did not elaborate on any possible motive."

UPDATED 5:15 p.m. ET: Authorities will not release the name of the suspected shooter, although the sheriff did confirm that person was a student at the school.

The "gunman asked for the location of a specific teacher, who heard he was being looked for, and left the school 'in an effort to draw the student away from the school.'"

A second student was injured during the incident, although that person was not shot.

One student at the school said he became aware of the incident after hearing "three bangs."